FARGO (AP) - A man was arrested on sex charges after an early morning escapade while wearing a kilt.

Police say Nathan Blair, 24, of Moorhead, Minn., was wearing a black kilt when he exposed himself to motorists near a busy street and had sex with a woman in the backyard of a home.

"In 17 years in this job I've seen a lot of different things. This is a new one," Fargo Police Lt. Pat Claus said Friday.

Claus said Blair and a 20-year-old woman from Fargo were arrested at about 3:30 a.m. Friday after police found them having sex behind a home. The couple first ignored orders by police to "cease and desist," and then refused to cover up, Claus said.

Both of them had been drinking, Claus said.

"We've caught people engaging in amorous behavior before, but usually they stop when we ask them to," Claus said.

Blair was still wearing a kilt and "FOR SALE" T-shirt when he appeared by video in East Central District Court on Friday morning. He pleaded not guilty to misdemeanor charges of fornication in a public place and indecent exposure.

Blair's lawyer, Tanya Johnson Martinez, said Friday she was still gathering information on the case.

The woman had not been formally charged.

Police received two complaints within a minute of each other about a man exposing himself near the 1000 block of North University Drive, one of the city's main thoroughfares. One of the complaints involved a sex act, police said.